Pulley-brake for motor-controlled apparatus.



M. TAIGMAN.' 4 PULLEY BRAKE POR MOTOR GONTROLLED APPARATUS.

APPLIOATIONVIILED APR. 3. 1912-. l

Patented Nov. 19, 1912. y

"145 r machine, preferably to the pulley. For that UNITED sTATEs PATENTorrrcn MAX TAIGMAN, or NEW Yonx, N. Y.

PULLEY-BRAKE FOR 1\t[0r'.llOIL-CONTROLlLED4 APPARATUS.

Spec'ificaton'of Letters Patent.

Application filed April 3, 1'912. Serial No. 688,287.

. To all whom 'it may concern: l Be it known 'that I, MAX TAIGMAN, acitizen of the United States, and a -resident of the city of New4 York,borough of Manhattan, in the county and State of New York, have inventeda new and Improved Pulley- 'Brake for Motor-Controlled Apparatus, ofwhich the following is a full, clear, and exact description.

' My invention relates to the brake mecha-4 Reference is to be had tothe accompany?.

ing drawings, forming a part of this speciication, in which slmilarcharacters of reference indicate corresponding parts 1n all V theligures, and inl which-e' Figure- 1 is a side View in elevation indieating the Alocation of my brake on a 'sewing machine; Fig. 2 -is afront elevation of my brake mechanism with the'.cover ofthe c asingvpartially broken away; Fig. 3 is a side elevation of the device lookingat the right 'of' Fig. 2, and Fig. 4 is a side elevation of part of thecasing showing a modified form of brake lever support.

Referring more particularly to Fig. l, there` is'4 disclosed a sewingmachine frame 5, which maybe'of any suitable character 'and which may beprovided with a drive pulley 6, which is driven directly from the motoror other suitable source of energy. It is f desirable to provide aunitary -nieans fr shutting off 'the current to the motor, and, at thesame time, to apply the brake to some of the movlng parts of thepurpose, a brake shoe 7 of any suitable construction ismounted on -theframe of the I' machine so as-to bring the shoe into firm engagementwith .the pulley wheel at 'the same time that'the current is shut off.This brake shoe-wears down, and in some cases it is desirable that theshoe 4should bear on the pulley or other .movable part with varying 55force withvdiiferent of tension, and

end -of which rodl is suitably to'attain this object the brake shoeshould be mounted to vary the extent of movement of the shoe withoutchanging the movement of the device which controls the passage ofcurrent to the motor; Preferably, the brake vmechanism is mounted uponva casing 8 containing contact plu s 9, through which the current is`complete in a mannervdescribed 1n the above identified specification,this specific form o f'electric Contact forming noV part of the presentcase.

Suitably mounted on thelside of the casing and extending into the same,is a switch arm 10 pivoted on a. cotter pin 11 carried in a journal onthe side of the casing, said switch arm having an exteriorly extendingratentednov. 19, wie.

portion 152, which portion has an eye 13 in4 the free end thereof,pivoted to' which eye -is the upper end of a reach rod 14, the lowerivoted to a treadle 15. The reach rod 14 1s preferably in two orinorev parts vconnected togetherby means of.a sleeve-and-nut connection 17, s0-

as to adjust the' length of the rod.v The extended portion 12 has'anaperture 16 extending therethrough, loosely mounted in which nsAaperture 16 is the reduced end 18 ofthe brake lever 19, the opposite endof which has suitfrom the switch arm 10. Extending paral- .lel to thelever 19 and fulcruined to the casably fastened thereto a brake shoe 7..This lever 1 9 extends substantially at right angles pivoted bymeans ofa pin 22 to said lever intermediate its length. By this construction itwill be seen that by depressing the treadle 15, the reach rod14 willdrawthe extension 12 of the switcli'arm downward acting through'the lever 19to raise the brake shoe 7 out ofA engagement with the pulley at the sametime that the opposite end of the switch arm l() vmakes vcontact throughthe proper plugs 9, to cause the motor to be actuate In order to varythe movement of the shoe 7 relative to the pulley G, the free end ofthebracket 21 is formed into alug 23, which lug is adapt-ed to rest upon astop screw 24 threaded into a lug 25 forming part 0f the casing 8; .Itwill be understood't-hat raising the screw 24 will swing'thebracket 21on` its pivoting' bolt 20. vthereby lowering ,the

l the bracket 21 may be inthe extending therethrough, and the screw 24lis held in adjustedv osition by `a. binding nut 26. Due to the ooseengagement of the reduced portion 18 in the apertune 16, the bracket 21lmay be adjusted lWithout interfering with the connection ofi l lever 21bylmeans of the screw 24.

In lor er to cushion and .limit the movemeut of, the Vswitch ar'm at'both extreme posiifons of its movement, there isl projectl ing fromopposite sides'of the 'switch arm, 10 within the casing' 8, a pairoftransv; 1sely-extending Wedge-shaped stops 29, lone of which stops ineach -of the limiting positions engaging one of a pair Ofbuing platesremovably affixed to the inside of the casing adjacent the openingthrough lWhich the switch arm lextends'.

Having; thus described my invention, I claim as new and desire|to secureby Letters Patent l 1. AV pulley. brake for motor-controlled apparatus,comprising a casing, a switch arm pivoted intermediate itslength to saidcasin said arm having an opening extend-l ing t erethrough, a leverextendingat an angle to said arm 'and having one end loosely positionedin saidopening, a brakeshoe mounted on' thel opposite end, a bracket -inthe'form of a-lever parallel to said tirst.

mentioned lever `and pivoted intermediate its length to said casing saidlever pivoted intermediate its length tok one end of said bracket, andan adjusting stop bearing on the free end of, said bracket to vary theposition of the bracket.

2. In a pulley 'brake for motor-controlled pivoting pointof said leverand apparatus, the combination of a switch arm 5.0

pivoted intermediate'its length, said arm lhaving an opening .extendingtherethrough,

a lever having one end slidably positioned in said opening andactuatedby said svvitcl: arm, a brake shoe mounted onthe opposite' end o'f saidlever, a bracket in the, form of a lever and pivoted intermediate itslengthI said lever pivoted .intermediate its length to one end of saidbracket, and adjusting means on .the free lend of said bracket tovary'the' 60 pivoting point of said lever -pendent of said ysvvitch armfor varying the movement of' said shoe relativev to 'said `element. v. Il' 4C. `The, combination of a brackety in the Vform of 'a-lever, a brakelever pivoted intermediate its length to the end of said bracket, andmeans engaging the freer end o flsaid bracket to vary the position ofthe pivotal Connection between, said -lever and bracket. 5. Thecombination of a bracket in the form cfa lever, a brake lever pivotedintermediate yits length to the end of said bracket, means engaging thefree end of said bracket to vary the position of the pivotal connectionbetween said lever and bracket, and .means independent of said. bracketactuating said brake lever.

.In 'testimony whereof I havesig'ned my name to lthis specification in'the presence of Itwo' subscribing witnesses.

. MAXTAIGMANQ Witnesses: 1 4

W. S. Carols, f PHILIP D.v RoLnHaUsu

